WMS - Watershed Modeling System - model interface for hydrologic models HEC-1, TR-20, NFF and Rational Method
WMS Categories: hydrological database/modeling/data analysis, model interfaces and modeling shells, surface-water models, watershed modeling
As part of the delineation process, WMS finds all flow paths on the entire terrain model. This allows you to inspect flow patterns anywhere inside of outside your watershed. Further, the longest flow path in each sub-basin is stored for use with the Time of Concentration Calculator. No other system available will match the accuracy and flexibility of the delineation functions in WMS!
WMS will allow you to take advantage of all types of GIS data available for hydrologic and hydraulic modeling. The GIS module of WMS 7 includes a complete set of tools for importing, creating, and manipulating GIS vector and raster data. ArcGIS/ArcView is not a required component of the WMS software! You will find that WMS can work with your GIS data effectively with or without ArcGIS. A few of the powerful tools in WMS include:
Direct linkage with ESRI's ArcGIS 8.x - this lets you use the powerful data catalog tools of ArcGIS in conjunction with WMS.
Terrain data can be created, merged, and manipulated using grids, TINs, or contour lines.
Data layers such as land use and soil type can be clipped to match your watershed.
Attribute tables can be joined and queried.
Images (TIFF, JPEG, MrSID) can be geo-referenced, joined, and clipped.
Attributes from data layers can be assigned to your model using GIS overlay operations.
New ``data tree" interface allows you to turn on/off, change display, change coordinate systems, and review contents of each data layer quickly and easily.
Coordinate System Conversions - Convert data between geographic and planar coordinate systems
Floodplain Modeling and Mapping
Whether you have used WMS to run a HEC-RAS model or obtained hydraulic analysis results elsewhere, the tools for floodplain delineation and mapping in WMS will create the results you need for your flood study. The powerful interpolation algorithms in WMS allow you to create flood extents and flood depth maps using digital terrain data and water surface elevation data points.
You can use the fast and easy channel hydraulics tools in WMS to create approximate (Zone A) maps. If you need a detailed analysis (Zone AE or AH), you will find the HEC-RAS interface and flood mapping tools are nicely integrated and intuitive in WMS.
The full process of flood modeling and mapping has been integrated into a seamless process in WMS. Perform a simulation with any hydrologic model (HEC-1 or HMS, TR-20, TR-55, Rational Method, MODRAT, NFF) and link the peak flow or complete hydrograph to a HEC-RAS model of the river channel in your watershed. Complete the set up of HEC-RAS with cross-section cutting, area attribute mapping (roughness values assigned by polygons), and automated assignment of thalweg and bank locations and downstream distances. Once a HEC-RAS simulation is completed, you can import the W.S.E. results directly from the HEC-RAS project files and use them to determine the flooding extents and depths on the terrain model in WMS.
Uncertainty in modeling parameters can now be analyzed using the automated stochastic modeling tools in WMS. These tools simplify and automate the process of varying certain parameters (such as CN or roughness) in a model, creating a model input file, and running the simulation over and over again. Some applications of this technology are:
Use HEC-1 with CN randomization to create probabilistic hydrograph results.
Use HEC-RAS with roughness randomization to create probabilistic water surface elevation results.
Link HEC-1 and HEC-RAS in series with randomization to create probabilistic floodplain maps.
Storm Drain Network Modeling
WMS has the capability of storm drain analysis using the analysis code distributed by the FHWA as part of their HYDRAIN program. You can create a complete storm drain network (unlimited pipes and nodes) tightly integrated with your surface runoff model - including the option to link with any of the hydrologic models supported by WMS. StormDrain will perform all typical hydraulic computation (HGL, WSE, etc.); WMS provides various reporting tools for results of the model.
2D (Distributed) Hydrology
After many years of research and development, a 2D surface/groundwater hydrologic model is now available in WMS! The GSSHA model is the perfect solution for studies which require analysis of 2D surface flow and groundwater/surface water interaction. The model uses a 2D finite-difference grid to analyze surface runoff, 1D channel hydraulics, and groundwater interaction in a comprehensive hydrologic cycle model. Water quality and sediment transport processes may also be modeled with GSSHA. The model is capable of single event or long term rainfall simulation; radar rainfall data is supported in either case. Typical applications of this model are:
Flood forecasting (depth and velocity over entire 2D domain)
Thunderstorm (localized rainfall) flood analysis
Surface ponding and infiltration analysis
Groundwater/surface water interaction modeling
Obtaining and formatting digital data is often the most time-consuming task in watershed modeling. The WMS development team has been hard at work ensuring that WMS is compatible with as many file formats as possible. Further, they have dedicated a website to learning about and obtaining GIS data to use with WMS. Please visit the link below to learn about where to download free data, how to use it, and other informaiton.
WMS GeoSpatial Data Aquisition - http://emrl.byu.edu/gsda/
Some of the more popular data formats supported by WMS are:
USGS DEMs - download and use any format of DEM from the USGS.
USGS NED data - seamless elevation data can be downloaded and read into WMS.
ArcGIS Raster (ASCII format) - read elevation or attribute data in gridded format from ArcGIS.
ESRI Shape files - read all shapes and attributes into WMS.
DXF and DWG CAD files - WMS now supports the latest versions of DXF and DWG.
TIFF, JPEG, and MrSID images - images along with geo-referencing information can be read by WMS.
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